error 2662: can not convert 'this' pointer from .. to ...
Hello there,
I'm creating kind of a GUI system, and I found myself in trouble when inheriting my base class in my other classes.
This is the gui header:
Code:
#ifndef _GUI_H
#define _GUI_H
#define WIN32_MEAN_AND_LEAN
#include <windows.h>
#include <vector>
#include <string>
#define GUI_VERSION 1.0.0.1
#define TRUE 1
#define FALSE 0
#define STRUE "true"
#define SFALSE "false"
#define PGET(p) get_##p()
#define PSET(p,v) set_##p(v)
// Property related
#define DECLARE_PROPERTY(p,t) t get_##p(); \
void set_##p(t);
#define DECLARE_RO_PROPERTY(p,t) t get_##p();
#define DECLARE_WO_PROPERTY(p,t) void set_##p(t);
// Number to bool
#define NTOB(n) (n>0)? TRUE : FALSE;
namespace GUI{
struct COORD_S{
int x;
int y;
COORD_S(int _x, int _y)
{
this->x = _x;
this->y = _y;
}
COORD_S()
{
COORD_S(0,0);
}
COORD_S& operator=(const COORD_S& c)
{
if(this == &c) return *this;
this->x = c.x;
this->y = c.y;
return *this;
}
COORD_S& operator+(const COORD_S& c)
{
if(this == &c) return *this;
this->x += c.x;
this->y += c.y;
return *this;
}
COORD_S& operator+(const int i)
{
this->x += i;
this->y += i;
return *this;
}
COORD_S& operator-(const COORD_S& c)
{
if(this == &c) return *this;
this->x -= c.x;
this->y -= c.y;
return *this;
}
COORD_S& operator-(const int i)
{
this->x -= i;
this->y -= i;
return *this;
}
COORD_S& operator*(const COORD_S& c)
{
if(this == &c) return *this;
this->x = this->x*c.x;
this->y = this->y*c.y;
return *this;
}
COORD_S& operator*(const int i)
{
this->x = this->x*i;
this->y = this->y*i;
return *this;
}
bool operator==(const COORD_S& c)
{
if(this == &c) return true;
return ((this->x == c.x) && (this->y = c.y));
}
};
struct SIZE_S{
int width;
int height;
SIZE_S(int _w, int _h)
{
this->width = _w;
this->height = _h;
}
SIZE_S()
{
SIZE_S(0,0);
}
SIZE_S& operator=(const SIZE_S& c)
{
if(this == &c) return *this;
this->width = c.width;
this->height = c.height;
return *this;
}
SIZE_S& operator+(const SIZE_S& c)
{
if(this == &c) return *this;
this->width += c.width;
this->height += c.height;
return *this;
}
SIZE_S& operator+(const int i)
{
this->width += i;
this->height += i;
return *this;
}
SIZE_S& operator-(const SIZE_S& c)
{
if(this == &c) return *this;
this->width -= c.width;
this->height -= c.height;
return *this;
}
SIZE_S& operator-(const int i)
{
this->width -= i;
this->height -= i;
return *this;
}
SIZE_S& operator*(const SIZE_S& c)
{
if(this == &c) return *this;
this->width = this->width*c.width;
this->height = this->height*c.height;
return *this;
}
SIZE_S& operator*(const int i)
{
this->width = this->width*i;
this->height = this->height*i;
return *this;
}
bool operator==(const SIZE_S& c)
{
if(this == &c) return true;
return ((this->width == c.width) && (this->height = c.height));
}
};
// Events
enum Events{
EVENT_NULL = (0<<0),
EVENT_MOUSE = (1<<0),
EVENT_KEYBD = (1<<1)
};
// Mouse events
enum MouseEvents{
MOUSE_NULL = (0<<0),
MOUSE_MOVE = (1<<0),
MOUSE_DOWN = (1<<1),
MOUSE_UP = (1<<2),
MOUSE_MBUTTON1 = (1<<3),
MOUSE_MBUTTON2 = (1<<4),
MOUSE_MBUTTON3 = (1<<5),
MOUSE_SCROLLUP = (1<<6),
MOUSE_SCROLLDOWN = (1<<7)
};
// Keyboard events
enum KeybdEvents{
KEYBD_NULL = (0<<0),
KEYDB_KEYDOWN = (1<<0),
KEYBD_KEYUP = (1<<1)
};
enum{
};
};
#endif
This is the header of my base class:
Code:
#ifndef _OBJECT_H
#define _OBJECT_H
#include "gui.h"
namespace GUI{
class CObject{
public:
CObject();
CObject(const CObject&);
virtual ~CObject();
CObject& operator=(const CObject&);
const CObject& operator=(const CObject&) const;
DECLARE_PROPERTY(name,std::string);
protected:
private:
std::string sName;
};
};
#endif
This is the code of the inheriting class:
Code:
#ifndef _CONTROL_H
#define _CONTROL_H
#include "gui.h"
#include "object.h"
namespace GUI{
class CControl : public CObject{
public:
CControl();
CControl(const CControl&);
virtual ~CControl();
CControl& operator=(const CControl&);
const CControl& operator=(const CControl&) const;
virtual LRESULT _WndProc(HWND, UINT, WPARAM, LPARAM);
DECLARE_PROPERTY(parent,CControl*);
DECLARE_RO_PROPERTY(hwnd,HWND);
protected:
static LRESULT CALLBACK WndProc( HWND , UINT , WPARAM , LPARAM );
private:
HWND m_hWnd;
CControl *m_parent;
};
};
#endif
The errors I get are the following:
- when trying to get/set the name of the object using the get_name/set_name functions, the compiler gives me the following error:
Code:
error C2662: 'GUI::CObject::get_name' : cannot convert 'this' pointer from 'const GUI::CControl' to 'GUI::CObject &'
- when trying to get/set the hwnd or parent of a control, i get the following error:
Code:
error C2662: 'GUI::CControl::get_hwnd' : cannot convert 'this' pointer from 'const GUI::CControl' to 'GUI::CControl &'
Anyone knows what is going on here?
Grtz, Tom.
